I just started playing and I'm seeing people selling thousands of hard to find currencies. Is the economy THAT flooded with the hardest to find currencies? Or are the currencies not where the money is?

in short, yes.

yes but

private
leagues

What is a private league?

Everything merges into the Standard leagues, so yes the market gets flooded.

The ladders are usually fine for a while

This post was edited by Meatstick on Nov 19 2018 11:46am

A temp league you can buy and add different mods yourself.
Like no stash etc

I saw a delve trading thread where he had thousands of chaos orbs :/ How does one end up with such an amount?

Lol chaos is easy to get.... Same with exalts, you just need to know what to sell and what to farm

Long story short? No. Hasn't been for a long, long time.